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INTANGIBLE ASSETS - Summary of Gross Carrying Amounts and Net Book Values of Intangible Assets and Goodwill (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Intangible assets    
Gross Carrying Amount $ 272,010 $ 272,010
Accumulated Amortization (78,474) (71,928)
Total $ 193,536 200,082
INDOCIN | Product Rights    
Intangible assets    
Remaining useful life 11 years 1 month 6 days  
Gross Carrying Amount $ 154,100 154,100
Accumulated Amortization (11,022) (7,812)
Total $ 143,078 146,288
SPRIX | Product Rights    
Intangible assets    
Remaining useful life 6 years 1 month 6 days  
Gross Carrying Amount $ 39,000 39,000
Accumulated Amortization (4,782) (3,389)
Total $ 34,218 35,611
CAMBIA | Product Rights    
Intangible assets    
Remaining useful life 1 year 9 months 18 days  
Gross Carrying Amount $ 51,360 51,360
Accumulated Amortization (37,447) (36,163)
Total $ 13,913 15,197
Zipsor | Product Rights    
Intangible assets    
Remaining useful life 1 year  
Gross Carrying Amount $ 27,250 27,250
Accumulated Amortization (24,965) (24,381)
Total $ 2,285 2,869
OXAYDO | Product Rights    
Intangible assets    
Remaining useful life 1 year  
Gross Carrying Amount $ 300 300
Accumulated Amortization (258) (183)
Total $ 42 $ 117